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Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig

From Thomas Gleixner <tglx@linutronix.de>
Newsgroups linux.kernel
Subject Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig
Date 2017-03-14 19:00 +0100
Message-ID <tkYTM-3Be-17@gated-at.bofh.it> (permalink)
References (1 earlier) <tgNDA-4Ek-23@gated-at.bofh.it> <tkV9x-Uf-21@gated-at.bofh.it> <tkWRX-29k-17@gated-at.bofh.it> <tkXO2-2Py-27@gated-at.bofh.it> <tkY7p-3hF-53@gated-at.bofh.it>
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On Tue, 14 Mar 2017, Andi Kleen wrote:
> The other option is to simply make it unconditional. That would
> be even simpler, but it is a bit more risky. Hmm, I suppose may
> be worth trying to find out what Windows uses. If they get away
> with MMCONFIG everywhere we should be too.

From the PCIe spec:

 The PCI 3.0 compatible Configuration Space can be accessed using either
 the mechanism defined in the PCI Local Bus Specification or the PCI
 Express Enhanced Configuration Access Mechanism (ECAM) described later in
 this section. Accesses made using either access mechanism are
 equivalent. The PCI Express Extended Configuration Space can only be
 accessed by using the ECAM.

The 1.0 spec has a similar wording (s/3.0/2.3).

Definitely the best way to go.

Thanks,

	tglx

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Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig Thomas Gleixner <tglx@linutronix.de> - 2017-03-14 15:00 +0100
  Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig Andi Kleen <ak@linux.intel.com> - 2017-03-14 16:50 +0100
    Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig Thomas Gleixner <tglx@linutronix.de> - 2017-03-14 17:50 +0100
      Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig Andi Kleen <ak@linux.intel.com> - 2017-03-14 18:10 +0100
        Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig Thomas Gleixner <tglx@linutronix.de> - 2017-03-14 19:00 +0100
          Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig Bjorn Helgaas <helgaas@kernel.org> - 2017-03-14 20:50 +0100
            Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig Andi Kleen <andi@firstfloor.org> - 2017-03-15 03:30 +0100
              Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig Bjorn Helgaas <helgaas@kernel.org> - 2017-03-15 04:00 +0100
                Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig Thomas Gleixner <tglx@linutronix.de> - 2017-03-15 11:10 +0100
                Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig Bjorn Helgaas <helgaas@kernel.org> - 2017-03-15 15:20 +0100
                Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig Andi Kleen <andi@firstfloor.org> - 2017-03-16 01:10 +0100
                Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig Thomas Gleixner <tglx@linutronix.de> - 2017-03-16 23:50 +0100

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